As a comment about
Butterfly Milkweed (Asclepias tuberosa),
farmerdill wrote:
When I was a kid, this plant was known locally as Chigger Weed. While it never appeared in numbers, the flowers were avoided because they attracted so many chiggers. In that area at that time, chiggers were more despised than ticks. There are a lot of plants called chigger weed in different locales, but the blossoms of this plant seem to pull them all the way from the next county.